An integral main cable saddle and single tower self-anchored cable-stayed-suspension system bridge

Abstract

The invention provides an integrated main cable saddle and a single-tower self-anchored cable-stayed-suspended system bridge. The integrated main cable saddle comprises a saddle body, three cable grooves are machined in a ridge of the saddle body side by side, the middle groove is a far-section cable groove, and the middle-section cable groove and the near-section cable groove are formed in the two sides of the far-section cable groove; the shape lines of the groove bottoms of the far-section cable groove, the middle-section cable groove and the near-section cable groove are arcs, three circle centers of the three arcs are located on the same straight line, and the straight line where the three circle centers are located is an intersection line of the end face of the cable entering end of the saddle body and the vertical plane; and the projections of the end points of the three arcs on the end face of the cable entering end coincide in the vertical plane, the radius of the arc of the far-section cable groove is larger than that of the arc of the middle-section cable groove, and the radius of the arc of the middle-section cable groove is larger than that of the arc of the near-section cable groove. The integrated main cable saddle is designed asymmetrically and has the effects of a rotary cable and a bulk cable, respective routes are not overlapped, the saddle is arranged spatially along the arcs, and in the saddle discharging process, the slope of the tangent line of each curve is identical to that of an inhaul cable.

Description

technical field [0001] The invention belongs to the field of bridges, and relates to a main cable saddle structure, in particular to an integral main cable saddle and a single-tower self-anchored cable-stayed-suspension system bridge. Background technique [0002] Traditional self-anchored suspension bridges anchor the main cables to anchors at the ends of the girders. On the one hand, because the main cables are scattered at the beam end area behind the scatter saddle, limited by the main girder, the spreading space is limited, and the degree of dispersion of anchorage positions is much smaller than that of ground-anchored suspension bridges, resulting in a large local force on the anchorage, and the anchorage Down stress is quite complicated. On the other hand, since the main cable needs a lot of space to scatter, the volume of the anchor at the beam end needs to be increased a lot, which has a great impact on the appearance. [0003] In recent years, there has been a su...

AI Technical Summary

Problems solved by technology

Although this system avoids the problems of traditional self-anchored suspension bridge anchors, it has the following disadvantages: ① It does not have the ability to actively adjust: the main span of the bridge tower is anchored by sub-cables, its back is anchored by stay cables, and the cables on both sides are anchored The devices are back to back, and the internal space is very narrow, which makes the internal adjustment space limited; when there is an error in the cable installation, the operation space in the tower will limit the operation, affecting the construction progress and the alignment of the bridge

②Multiple cables are anchored on both sides of the bridge tower, and the local force is complicated, which is not conducive to design and calculation, and the more complicated design will cause the bridge tower to be bulky and affect the overall beauty of the bridge; ③The bridge is fixed due to loose cable points and cables For the fixation of the anchor point, the adjustment of the cable can only be limited to the degree of multiple tensioning of the cable. A single adjustment method is also a disadvantage of construction safety; The matching also directly affects the force of the whole bridge, and if there is a large construction deviation, it will affect the performance of the bridge

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